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58 articles from PhysOrg

Remote control for plants

Plants have microscopically small pores on the surface of their leaves called stomata. These help plants regulate the influx of carbon dioxide for photosynthesis. They also prevent the loss of too much water and withering away during drought.

Seeing some cosmic X-ray emitters might be a matter of perspective

It's hard to miss a flashlight beam pointed straight at you. But that beam viewed from the side appears significantly dimmer. The same holds true for some cosmic objects: Like a flashlight, they radiate primarily in one direction, and they look dramatically different depending on whether the beam points away from Earth (and nearby space telescopes) or straight at it.

Dying cells protect their neighbors to maintain tissue integrity

To enable tissue renewal, human tissues constantly eliminate millions of cells, without jeopardizing tissue integrity, form and connectivity. The mechanisms involved in maintaining this integrity remain unknown. Scientists from the Institut Pasteur and the CNRS today revealed a new process which allows eliminated cells to temporarily protect their neighbors from cell death, thereby maintaining...

Biosynthesis pathway of a new DNA nucleobase elucidated

DNA is composed of nucleobases represented by the letters A, T, G and C. They form the basis of the genetic code and are present in all living beings. But in a bacteriophage, another base, represented by the letter Z, exists. This exception, the only one observed to date, has long remained a mystery. Scientists from the Institut Pasteur and the CNRS, in collaboration with the CEA, have now...

Major revamp of SNAP could eliminate food insecurity in the U.S.

Food insecurity is a major problem in the U.S., and it worsened during the COVID-19 pandemic. The Supplemental Nutrition Assistance Program (SNAP) provides some relief, but millions of Americans still lack adequate access to healthy food. A new study from the University of Illinois proposes a potential solution.

Fireflies found to interact locally through an active network of visual connections

A trio of researchers from the University of Colorado Boulder, has found the secret to fireflies flashing in unison: interacting locally through an active network of visual connections. In their paper published in the journal Science Advances, Raphael Sarfati, Julie Hayes and Orit Peleg, describe their study of the glowing insects in the Great Smoky Mountains in Tennessee and North Carolina, and...

Efficient genetic engineering platform established in methylotrophic yeast

Pichia pastoris (syn. Komagataella phaffii), a model methylotrophic yeast, can easily achieve high density fermentation, and thus is considered as a promising chassis cell for efficient methanol biotransformation. However, inefficient gene editing and a lack of synthetic biology tools hinder its metabolic engineering toward industrial application.

Tracking a record-breaking heat wave

An unprecedented heat wave that started around June 26 smashed numerous all-time temperature records in the Pacific Northwest and western Canada. NASA's Atmospheric Infrared Sounder (AIRS), aboard the Aqua satellite, captured the progression of this slow-moving heat dome across the region from June 21 to 30. An animation of some of the AIRS data show surface air temperature anomalies—values...

The evolution of the giant panda's temporomandibular joint and premolar teeth enabled adaptation to bamboo diet

Although the giant panda is in practice a herbivore, its masticatory system functions differently from the other herbivores. Through the processes of natural selection, the giant panda's dietary preference has strongly impacted the evolution of its teeth and jaws. Researchers from the Institute of Dentistry at the University of Turku and the Biodiversity unit of the University of Turku together...

Evolution in real time

How does unicellular life transition to multicellular life? The research team of Professor Lutz Becks at the Limnological Institute of the University of Konstanz has taken a major step forward in explaining this very complex process. They were able to demonstrate—in collaboration with a colleague from the Alfred Wegner Institute (AWI)—that the unicellular green algae Chlamydomonas reinhardtii,...

A mitochondrial self-preservation mechanism

Mitochondria, the powerhouse of the cell, convert sustenance into energy, fueling the cell's activities. In addition to power, mitochondria also produce reactive oxygen species, byproduct molecules primed to help facilitate communication among the other units in the cells. But when produced too abundantly, they damage DNA and render some cellular components dysfunctional. Now, an international...

Seeing with radio waves

Scientists from the Division of Physics at the University of Tsukuba used the quantum effect called 'spin-locking' to significantly enhance the resolution when performing radio-frequency imaging of nitrogen-vacancy defects in diamond. This work may lead to faster and more accurate material analysis, as well as a path towards practical quantum computers.

Understanding the molecular underpinnings of a disease affecting corals

Coral reefs are a favorite spot for scuba divers and are among the world's most diverse ecosystems. For example, the Hawaiian coral reefs, known as the 'rainforests of the sea', host over 7,000 species of marine animals, fishes, birds and plants. But coral reefs are facing serious threats, including a number of diseases that have been linked to human activity.

Scientists explore seamounts in Phoenix Islands Archipelago, gain insights into deep water diversity

Marine scientists aboard Schmidt Ocean Institute's research vessel Falkor have identified likely new marine species and deep sea organisms on nine seamounts that were explored for the first time in the remote Phoenix Islands Archipelago. In a 34-day expedition that ended today, scientists also conducted high-resolution seafloor mapping of more than 30,000 square kilometers and video exploration of...